How to calculate the fan distribution box
The size of the plenum box can be determined by calculating the cross-sectional area, and then multiplying that figure by the required air flow. The selection graph below will help determine the size of the fan required for your application. air) from one place to another for extraction, air-conditioning, compression, etc. One of the most important considerations when sizing a plenum box for HVAC is the air flow required. Bernoulli's equation in its simple form shows that, for an elemental flow stream, the difference in total pressures between any two points in a duct is equal to the pressure loss between these points, or:.
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